Find the simple interest for $5,000 at 5.3% for 16months rounded to nearest cent

What is the quadric regression equation that fits these data

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?